Hello everyone! I'd just like to share my opinion on this. I do agree with using window tint. It acts like an insulator keeping the heat out and the cool air in.
Now if you're looking to save on fuel while keeping the a/c on, you can try cycling the a/c at key points:

- Turn a/c off during hillclimbs and when you're accelerating
- 1/2 temperature setting on flat and straight highways
- Maximum temperature setting going downhill

If you want to learn and share more tips and tricks on Driving to Maximize Fuel Economy, visit www.hypermileph.com and logon to the forum. Thanks!